Are you trying to stay in BIAB or are you willing to go into your DAW. I think you have seen the limitations of BIAB when you try to specify voicings or these model extensions. I agree with you "...don't work in BIAB".

Ya, there are workarounds, but the bottom line is BIAB was simply not designed for this fine detail. That doesn't stop you using the strengths of BIAB to do the grunt work to layout your arrangement and accompaniments. But this fine tuning needs to go to your DAW. And of course forget about RTs. This needs a midi solution. I write and edit my extended chordal arrangements in Scaler2 which gives you this control over the chordal notes. Then I combine the BIAB tracks with Scaler chords in Reaper.

Just a suggestion others may have other ideas.

Dan, BIAB2024, SoundCloud Win11, i7(12thGen), 32GB, 1TB SSD(M.2 NVMe SSD), 2TB Libraries, 1 TB(WD-Black), 2TB SSD(M.2 NVMe SSD)Data, Motu Audio Express, Keystation 61, SL88 Studio, Reaper